improve cull, so we don't create empty segments

src/effects/SkDashPathEffect.cpp

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkDashPathEffect.h"
 
 #include "SkDashPathPriv.h"
@@ skipping 76 matching lines @@
     if (dx) {
         SkASSERT(dx && !dy);
         SkScalar minX = pts[0].fX;
         SkScalar maxX = pts[1].fX;
 
         if (dx < 0) {
             SkTSwap(minX, maxX);
         }
 
         SkASSERT(minX < maxX);
-        if (maxX < bounds.fLeft || minX > bounds.fRight) {
+        if (maxX <= bounds.fLeft || minX >= bounds.fRight) {
             return false;
         }
 
         // Now we actually perform the chop, removing the excess to the left and
         // right of the bounds (keeping our new line "in phase" with the dash,
         // hence the (mod intervalLength).
 
         if (minX < bounds.fLeft) {
             minX = bounds.fLeft - SkScalarMod(bounds.fLeft - minX, intervalLength);
         }
@@ skipping 10 matching lines @@
     } else {
         SkASSERT(dy && !dx);
         SkScalar minY = pts[0].fY;
         SkScalar maxY = pts[1].fY;
 
         if (dy < 0) {
             SkTSwap(minY, maxY);
         }
 
         SkASSERT(minY < maxY);
-        if (maxY < bounds.fTop || minY > bounds.fBottom) {
+        if (maxY <= bounds.fTop || minY >= bounds.fBottom) {
             return false;
         }
 
         // Now we actually perform the chop, removing the excess to the top and
         // bottom of the bounds (keeping our new line "in phase" with the dash,
         // hence the (mod intervalLength).
 
         if (minY < bounds.fTop) {
             minY = bounds.fTop - SkScalarMod(bounds.fTop - minY, intervalLength);
         }
@@ skipping 223 matching lines @@
 
 SkFlattenable* SkDashPathEffect::CreateProc(SkReadBuffer& buffer) {
     const SkScalar phase = buffer.readScalar();
     uint32_t count = buffer.getArrayCount();
     SkAutoSTArray<32, SkScalar> intervals(count);
     if (buffer.readScalarArray(intervals.get(), count)) {
         return Create(intervals.get(), SkToInt(count), phase);
     }
     return NULL;
 }